JPH0650607B2 - Arc extinguishing device for medium to high voltage switching devices - Google Patents

Abstract

In an arc quenching device a quenching chamber filled with sulfur hexafluoride is provided with a plurality of superimposed overlapping ascending quenching plates having openings defining arc inlets. A movable contact cooperating with a stationary contact is insertable via the arc inlets into the quenching chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention has an arc-extinguishing chamber filled with sulfur hexafluoride or a mixture containing sulfur hexafluoride, and at least one for each phase is provided in the chamber. An arc extinguishing device for a medium- or high-voltage switch device incorporating one fixed contact member and one movable contact member, the arc extinguishing device comprising an arc extinguishing plate, the arc extinguishing plate corresponding to the contact member, In addition, the present invention relates to a type in which the distance from the end of the movable contact member to the electric arc entrance of the arc extinguishing plate is increased in the arc extinguishing chamber wall as the opening angle of the movable contact member increases.

[Prior Art] An arc extinguishing device has a problem of extinguishing an electric arc generated in a switch when shutting off. This type of arc is caused by the vaporization of the metal bridging piece of the contact due to the electric current heat when opening the contact.
In load disconnects and circuit breakers, it is important to extinguish such an arc as quickly as possible and to provide sufficient insulation between the contacts. In the case of direct current, it is important to achieve a large arcing voltage in the switch chamber, whereas in the case of alternating current it is possible to reduce the charge carriers effectively between the zero crossing and the rise of the recovery voltage in a short time. is important. In this case, it is important to cool the arc section sufficiently.

By the way, there are various means for extinguishing an electric arc between two opened contact members. It is known to blow an electric arc into the switch chamber by means of a magnetic field, where cooling is effected by correspondingly constructed and arc-proof chamber walls.

However, the medium-voltage circuit breaker operating according to the known method described above requires a relatively large arc-extinguishing chamber and is extremely expensive due to the manufacturing cost of the arc-extinguishing chamber.

In the medium to high voltage range, this can be done by generating a vigorous gas flow from the switch itself towards the arc zone to be cooled. A switch operating on this principle is known from EP-A-00068951. On the other hand, the arc-extinguishing gas is pressurized to the required pressure by the compressor and stored in the container. However, both arc extinguishing means are associated with a great manufacturing cost.

[Problems to be Solved by the Invention] An object of the present invention is to provide an arc-extinguishing device, particularly for a medium to high voltage switching device, which can be manufactured at a lower cost as compared with a conventionally known device with equivalent performance. Was to do.

[Means for Solving the Problem] According to the present invention, in the device of the type described at the beginning, the arc extinguishing plates are arranged in rows in substantially parallel planes and the ends of the movable contact member are provided. Spaced apart and offset from each other along the trajectory of movement of the movable contact member and substantially perpendicular to the movable contact member in the closed position, the end of the movable contact member and the contact member being released. The distance between the individual arc-extinguishing plates that continuously pass during movement increases as the opening angle increases, and the edge of the arc-extinguishing plate that passes first is immediately near the fixed contact member. Is solved by being present in.

[Advantages of the Invention] An advantage achieved by the present invention is that the arc extinguishing device is downsized by using the arc extinguishing plate. Furthermore, the arc extinguishing device is simple to manufacture and can be easily integrated into existing equipment.

EXAMPLES Next, the present invention will be described in detail with reference to the illustrated examples.

According to FIG. 1, a movable contact member 1 configured as a double break contact of a switch device is shown, the pivot point of which is on the bush 2. The movable contact member is connected to a connecting rod 3 assigned to drive it. The contact member corresponding to the movable contact member forms a fixed contact member 4, which is fixed to the bus bar 5. Posts 6 serve to receive the busbars.

According to FIGS. 1 to 3, the arc extinguishing device includes a large number of arc extinguishing plates 8.
Arc extinguishing chamber 7 in which is mounted. The arc extinguishing plate 8 is surrounded by an arc extinguishing chamber wall 10 made of an insulating material. The arc-extinguishing plate 8 is made of a metal, especially a steel plate, and the metal is provided with a metal layer different from this metal.

In this case, the arc extinguishing plates are parallel to each other and overlap,
They are arranged so as to form a closed surface in plan view, and the arc inlet 9 faces the movable contact member. Furthermore, the electric arc entrance is arranged so that the distance from the end of the movable contact member to the electric arc entrance of the arc extinguishing plate increases as the opening angle of the movable contact member increases. The plastic retaining members 11 and 12 provide the connection between the arc extinguishing walls of both, and furthermore, the plastic retaining member 12 still serves to secure the arc extinguishing plate to the busbar.

The arc extinguishing chamber 7 according to the present invention can be used in combination with an electric arc blowout device.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an arc extinguishing device assigned to a switch device,
FIG. 2 is a side view of the arc extinguishing device, and FIG. 3 is a plan view of the arc extinguishing device. 1, 4 ... Contact member, 5 ... Bus bar, 7 ... Arc extinguishing chamber, 8 ...
… Extinguishing plate, 9 …… Electric arc entrance, 10 …… Extinguishing chamber wall, 1
1, 12 ... Holding member

Claims (8)

[Claims] 1. An arc extinguishing chamber filled with sulfur hexafluoride or a mixture containing sulfur hexafluoride, wherein at least one fixed contact member and movable contact member for each phase are incorporated in the chamber. To a high-voltage switching device, which comprises an arc extinguishing plate (8), said arc extinguishing plate corresponding to a contact member (1, 4), and an arc extinguishing chamber wall. In (10), the distance from the end of the movable contact member (1) to the arc entrance (9) of the arc extinguishing plate is arranged to increase as the opening angle of the movable contact member (1) increases. The arc-extinguishing plates (8) are arranged in rows in substantially parallel planes and are spaced and displaced from each other along the locus of movement of the ends of the movable contact member (1). And arranged substantially perpendicular to the movable contact member (1) in the closed position,
Moreover, the distance between the end of the movable contact member (1) and the edge of each arc-extinguishing plate (8) through which the contact member continuously passes during the release movement increases as the opening angle increases. The arc-extinguishing device for medium to high-voltage switching devices, characterized in that the edge of the arc-extinguishing plate (8) which is passed first is in the immediate vicinity of the fixed contact member (4). 2. Medium-to-high voltage medium according to claim 1, characterized in that the arc-extinguishing plates (8) are arranged parallel and overlapping each other and forming a closed surface in plan view. Arc extinguishing device for switch device. 3. A medium or high voltage switch device according to claim 1, wherein the arc extinguishing plate (8) is surrounded by an arc extinguishing chamber wall (10) made of an insulating material. Arc extinguishing device. 4. An arc-extinguishing device for a medium- or high-voltage switching device according to any one of claims 1 to 3, wherein the arc-extinguishing plate (8) is made of a steel plate. 5. The arc-quenching plate (8) is made of metal,
An arc-extinguishing device for a medium to high voltage switching device according to any one of claims 1 to 3, wherein the metal is provided with a metal layer different from this metal. 6. Arc-extinguishing plates (8) are in contact with each other and with the contact members (1,
4) An arc-extinguishing device for medium to high-voltage switching devices according to any one of claims 1 to 5, which is insulated against the busbar (5). 7. A holding member (1) having two arc-quenching chamber walls (10).
An arc-extinguishing device for medium- and high-voltage switching devices according to claim 3, which is connected to the arc-extinguishing chamber (7) by means of (1, 12). 8. A medium- or high-voltage switching device according to any one of claims 1 to 7, characterized in that the arc-extinguishing chamber (7) can be used in combination with an electric-arc blow-off device. Arc-extinguishing device.